/Engine/Source/Runtime/GameplayTags/Classes/GameplayTagsManager.h
Gets a Tag Container containing all of the tags in the hierarchy that are children of this tag, were explicitly added to the dictionary, and do not have any explicitly added tags between them and the specified tag
[FGameplayTagContainer](API\Runtime\GameplayTags\FGameplayTagContainer) RequestGameplayTagDirectDescendantsInDictionary ( const [FGameplayTag](API\Runtime\GameplayTags\FGameplayTag) & GameplayTag, EGameplayTagSelectionType SelectionType ) const